Printing-machine.



E. H. GOTTRBLL. PRINTING MACHINE.

APPLICATION rum) MAY 22, 1911.

1,072,702. Patented Sept. 9, 1913.

D e R 1 w a e R TIM a m a m COLUMBIA PLANOGRAFH CO WASHINGHON, D. c

' To all whom it may concern:

Print, on ivnw YORK, v. Y., A QORPORATION.OF'NEW- JERSEY.

j remains-Macrame.

Be it known that I, EDGAR H. COTTRELL,

a citizen of the United States, and resident.

of the borough of Manhattan, in the city and State of New York, have invented ,a new and useful Improvement inv Printing- Machines, of which the following is a specification.

This invention relates to, printing ma,

chines and is directed particularly'to shifting tympan holding'devices; U

The object of this invention broadly is to provide means for subjecting the shifting tympan to variations in pressure whereby itwill be subjected to one'pressurewhile inits fixed position and to another pressure during its shiftingoperation.v

The object of this invention more specifi i cally is to provide a device which will hold the tympan tightly. against its cylinder by suction, said device being also arranged to blow the tympan away from the cylinder during the shifting operation, whereby the tympan is prevented from slipping when in its fixed position and its shifting opera. tion .is materially facilitated- A practical embodiment of this invention is, represented in the accompanying drawings, in which Figure l shows the tympan ho ding t levice in side elevation, so much of a'print ing machine being shown as will give a clear understandinggoi? the operation of the device, Fig. 2 is a partial endfview and sec tion of the same, the shiftin tympans and their, operating mechanism being removed,

Fig. 3 is, a detail plan view'ofthe perfo- 1 rated suction segment, Fig. 4 is a transverse 7 section throughthe same, Fig. 5. is a detail side. view of the suction segment, and Fig. dis a detail cross section throughthei i1npression cylinder in the plane of one Set ofsuction'segments, the shifting tympans being shown in position thereon.

The impressioncylinder, is denotedby 1, which cylinder is. herein shown as provided with plurali y of shif g tympans 2; the means shown in Fig. G for shifting the tympans; at; desired intervals, may be operatedby any well known or approved mechanism, such, for instance, as that shown in the United States patentto Howard M.

Barber, No. 996,902, granted July-2 1, 1911. l-Iollo pcrtiorated tubes 3., thefto m.

of segments, are located circumferentially Patented se tgo, 1913.

for instance,at points where they will engage the margins of the shifting tympans 2. The perforations 4 in these hollow segments seen t. COTTRELL,- on new YORK, 1v. Y1, nssIe on TO 0. B. ooTrRn & sons com in the peipha the cylinder 1 at the de? 7 slred points in the length of the cylinder, as,

3 arelocated alongtheir flattened exterior Walls so that when the interior of these holthe tympans away from theirj engagement with the cylinder. 7 V Theshaft 5 of the cylinder 1 is tubular in. :form, its bore being denoted" by 6. Pipes or passages 7 bring the interiors of the h0l-. low segments 3. into open communication .withthe bore 6 ofthe hollow shaft 5. This shaft 5 is mounted in suitable hearings in the side frames 8 of the machine. U V

A' cylinder gear 9 is-fast on the shaft 5 and is driven from a suitable driving gear 10 through an intermediate gear'll. The bore 6 of'the hollow cylinder shaft 5 is pro vided with one or more holes 12 throughits walls communicating'with an annular chamber 13 in a collar 14 at one .endofa pipe15,

low segments are subjected to-v suction the perforations 1 will draw. the ,tympan tightly against the cylinder and when the interior of these hollow segments are subjected to, air pressure the per-forationst will blow which pipe 15 connects with an. exhaust" pump such, for instance, as a blowing engine 16 through a branch pipe 17 and with a compressed air reservoir or tank 18 through a branch pipe 19. A two-way cock '20 serves to open the pipe 15 either to the pipe 19; or the pipe 17 according to the position of the cock. A pipe 21 leads from. the-blowing engine-16 to the Compressed air reservoir 18. pipe 17 may. be provided with a suction valve 22 so that air. may be drawn into the blowing engine even when the cock-20 closes communication between the pipe .15' and P P The. cook 20 is provided with an arm 23 which is connected to atwo-armed lever 24 The and 25 by a rod 26. An expansion spring- 27 is arranged to exert its pressure in a direction tending to swing the arm 23 to openf communication between the pipe 15 and the" 1 29 is provided with a cam stud or roller 33 engaging the face of the cam 28.

A two-armed trip lever 34, 35, is pivoted at 36 and an expansion spring 37 engages the arm 35 tending to swing the same inwardly toward the shaft 5 of the cylinder.

The arm 34 is provided with a notched por the lever 34, 35, in position to be engaged j by the head of the 'tappet 42 when the lug 41 coacts with the tappet for swinging the arm 35 outwardly a suflicient distance to lift the arm .34 out of its locking engagement with the arm of the rock lever 24, 25.

The operation is as follows :+When the printing machine is in operation, except when the tympans are to be shifted, the cock 20 is in a position to open the pipe '15 to the pipe 17 thus causing the blowing engine 16 to exhaust the' air from the hollow segments 3 through the pipes or passages 7, hollow shaft 5 and pipes 15 and 17 This will cause the tympan to be sucked snugly against the cylinder and thereby absolutely prevent the tympanfrom slipping; Just,

before the time for the tympans to be shifted, the lug 41 comes into contact with the tappet 42, causing the tappet to push the arm 35'of the rock lever 34, 35, outwardly thereby disengaging its arm 34 from the arm 25 of the rock lever 24, 25. At about this time, the surface of the cam 28 will recede thus permitting the spring 27 to swing the cock 20 into position to open communication between the pipes 15 and 19 and close communication between the pipes 15 and 17. This will permit the compressed air from the tank or reservoir 18 to escape through the pipes 19, 15, into the hollow shaft 5 and from thence outwardly through the perforations 4 in the hollow segments 3, serving to lift the shifting tympansv away from the cylinder just before and during their shifting operation, thereby serving to materially assist in the shifting of the tympans. After the tympans have been shifted, the cam 28 will force the arm 23 of the cook 20 backwardly a sufficient distance to close communication between the pipes 15 and 19 and again open communication between the pipes 15 and 17 for subjecting the shifted tympan to suction. This movement ofthe arm 23 will also swing the'lever 24, 25, back into pos tion to be interlocked with the lever 34, 35, thereby holding the cock comes of this patent maybe obtained for 20 in. said position, until the differential gears 39, 40, again bring the 111g 41 into coaction with the tappet 42. i

It is to be understood that the perforations corresponding to the perforations in the hollow segments, are formed through any pack- .ingon the cylinder under the tympans so as to vinsurethe subjection of the tympans 'to the suctionand blowing action hereinabove described.

While I have shown this invention in connection withacylinder having a plurality of tympans it is to be understood that' the 'use of the same is not limited to any particular number of tympans.

might be resorted to in theconstruction, form and arrangement of the several parts without departing from the spirit and scope of my invention; hence I do not wish to limit myself strictly to the structure herein set forth, but 7 What I claim is I p 1. In combination, a cylinder, a shifting tympan thereon and a common means for subjecting the tympan to suction while fixed and for removing the suctionwhen shifting. 4. In combination, a cylinder, a. plurality of shifting tympans thereon and a common means for subjecting the tympans to suction while fixed and for removing the suction when shifting.

5. In combination, a cylinder, a shifting tympan thereon, and a common means for holding the tympan against the cylinder by suction and for blowing the tympan away from the cylinder during the shifting operation.

6. In combination, a cylinder, a plurality. of shifting'tympans thereon and a common means for holding the tympans against the cylinder by suction .and for blowing the tympans away from the cylinder during the shifting operation.

In testimony, that I claim the foregoing as my invention, I havesigned myiname' in presence of two witnesses, this I eighteenth day of May, 1911. V

' EDGAR II. COTTRELL. Witnesses: I

F. GEORGE BARRY, C. S; SUNDGREN.

It -is also evident that various changes five cents each, byjzi'ddressingthe Goinmissioner' of Patents. 'Washingt 

